EN8 vs EN9 difference in composition & properties.
Carbon: EN9 0.5–0.6% against EN8 0.36–0.44%.
Key differences between EN8 and EN9
- Carbon: EN9 0.5–0.6% against EN8 0.36–0.44%.
EN8 vs EN9 chemical composition (weight %)
| Element | EN8 | EN9 |
|---|---|---|
| C | 0.36–0.44 | 0.5–0.6 |
| Si | 0.1–0.4 | 0.1–0.4 |
| Mn | 0.6–1 | 0.5–0.9 |
| P | ≤0.05 | ≤0.035 |
| S | ≤0.05 | ≤0.05 |
Mechanical properties, equivalents and uses
| Property | EN8 | EN9 |
|---|---|---|
| Family | Carbon engineering steel | Carbon engineering steel |
| Tensile strength, MPa | 550–700 | – |
| Yield strength, MPa | – | – |
| Elongation, % | – | – |
| Hardness | 152–207 HB | – |
| Density, g/cm³ | 7.85 | 7.85 |
| EN | C40 / C45 (nearest) | C55 |
| W.Nr | 1.0511 / 1.0503 | 1.0535 |
| JIS | S40C / S45C | S55C |
| IS (India) | 40C8 (IS 1570) | 55C8 (IS 1570) |
| AISI / ASTM | AISI 1040 (nearest) | AISI 1055 (nearest) |
| Typical uses | Shafts, axles, bolts, studs, gears | Gears, sprockets, wear parts |
Mechanical values: Condition P, hardened and tempered (BS 970 tensile band). Limits vary by standard and product form; confirm against your purchase specification.
Frequently asked questions
What is the difference between EN8 and EN9?
Carbon: EN9 0.5–0.6% against EN8 0.36–0.44%.
Where are EN8 and EN9 used?
EN8: Shafts, axles, bolts, studs, gears. EN9: Gears, sprockets, wear parts.
Can EN9 replace EN8?
Only if the purchase specification allows it. Check the governing standard, chemistry limits and mechanical properties against the order, and confirm on the mill test certificate.
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Mill test certificate (EN 10204 3.1) supplied with material; third-party inspection on request.
Reference basis: Compiled by Steel Impex India. Check each table’s source, product form and delivery condition before use. Sources, calculation methods and corrections.